Radii and angle dresser



H, s. JAKoBsEN RADII AND ANGLE DREssER Jan. 2, 945.

Filed Jan. 14, 1943 s sheetsfsheet 1 SEE ' wrrnsssss a f 5 QRNEYS Jan 2,'1945 H. s. JAKoBsr-:N

RADI AND ANGLE DRESSER s sheets-sheet 2 Filed Jn. 14. 1943 Jan. 2. 1945. H. s. JAKoBsEN 2,366,623

I RADII AND ANGLE DRESSER Filed Jan. 14, 194s s sheets-sneu s In' 'Hi INVENTOR WITNESSES HarrD/Sujrobsen' Patented Jan. 2, 1945 Renn Nn ANGLE DREssER Harry S. Jakobsen, Harrison, N. J., assigner to J & S Tool Co., East Orange, N. J., a firm consisting of F. Henry Swenson and Harry S.

J akobsen Application January 14, 1943, Serial No. 472,390

6 Claims. (Cl. 1135-11) This invention relates to radii and angle dressers, and more particularly to a' radii and angle dresser adapted to dress grinding wheels and to cut said wheels in any desired manner so that they may, in turn, be used in grinding or nishing other materials.

An object of the invention is to provide` a dresser which cannot only grind the wheels at any desired angle, but which can apply a convex or concave radius to the wheels. With the present invention it is possible to dress the wheel to practically any desired surface or combination of surfaces. A

A further object is to provide a precision instrument having uses previously set forth, which will be simple to operateand completely accurate.

Other objects and advantages will become apparent as the description proceeds.

In the accompanying drawings- Fig. l is a perspective view of a dresser embodying my invention;

Fig. 2 is a side elevation thereof in cross section;

Fig. 3 is an end view showing the manner in which the upright may be pivoted;

Fig. 4 is a top plan view showing the manner in which the base may be turned;

Fig. 5 is a detail view of the stop mechanism;

Fig. 6. is a side elevation of an attachment for the dresser;

Fig. '1 is an end view of a portion of the attachment;

Fig. 8 is a top view of the portion shown in Fig. 7.

Referring more particularly to the drawings, my dresser is mounted on a base II on which are mounted two rings I2 and I3. Rings I2 and I3 are provided with stops I4 and I5, stop I4 being.

on the ring I2 and stop I5 being on the ring I3. Mounted on suitable bearings I6 and I1 is a swivel base I8 carrying a swivel base stop I9, the purpose of which will be discussed later.

Positioned on the front of the base II ,is a block 20 in which is a set screw. 2Icontrolling the ring clamp 22. It will be seen that by tightening the set screw 2|, the rings I2 and I3 may be secured againstl rotation. A Vernier plate 23 covers the ring clamp and is adapted toregister with the graduations on the swivel base I8.

' Dove-tailed into the swivel base 25 is a housing 26 upon which is fastened a bracket 21. A gib key 28 engages gib 29 and is held in place by bolts 30 to limit the movement of the housing in the swivel base. A micrometer block 3| is mounted on the swivel base and is adapted' to cooperate I with a similar block 32 in the housing. Positioned in the housing 26 is a shaft 33-having suitable bearings 34 and 35. Anupright 36 is mounted on the shaft 33 and is provided with an operating handle 31. Pivoted on the upright 36 is a centering block 38 provided with a lever 3'9. 'I'he lever 39 iscontacted by a springl 40 engaging the plug 4I in the groove 42 to normally keep the ends 43 in engagement with the upper sides of the bracket 21. The plug or pin 4I is press iitted into the upright 36 and not only serves to position the spring 40 but serves to limit 4theangular travel of the upright 36 to the length of the groove 42. It will be seen that by pressing down on the lever 39, the ends 43 of-the centering block 39 will be free from the ends 44 of the bracket 21 so that the upright 36 may be pivoted on the shaft.

Mounted on the upright 36 are washers 45 lhaving a flat side 46. By turning the flat side y46 of the washer 45 ush with the bracket 21, the upright 36 will be free to pivot in either direction when the centering blocks lever 39 is depressed. However, lshould either of the washers 45 be turned with its rounded side toward the bracket,-

it will prevent movement of the upright beyond the bracket.

Mounted in the top of the upright 31B in the opening 41, is the diamond 48 having a diamond point 49. The diamond is held in place by the diamond clamp 5I). A size block 5I is positioned on the upright .by means of the screw 52 and is adapted to position the diamond 48.

The dresser is adapted to be used on any standard magnetic chuck or may be bolted in place through the holes 53, if desired. In use, it is so placed in relation to the stone that the height pi the diamond is even with the center of the grinding, wheel spindle (not shown). The grinding wheel 54 is then in position to be dressed.

If a single angle is desired, the set screw 2| is loosened and the stops I4 and I5 are pushed into contact with the swivel'base stop I9. The

swivel base is then turned to the desired angle, thus pushing one of the stops and its ring with it. The set screw is then tightened and the wheel `may be dressed by releasing the centering block through its lever 39 and pivoting the upright on the shaft. Where two angles are desired, the set screw is loosened and the swivel base turned to the first angle, thus pushing the stop and the ring to that position; then turned back to the second desired angle, where the set screw is tightened.- During the dressing the swivel base stop should -be kept against the corresponding stop with care and pressure.

Where a convex radius ,is desired, the diamond is .fixed at a known distance, for instance two inches from the point to the b ack of the size block. The'gib 28 is then loosened and the housk ing centered until the same distance is measured..

between the micrometer block 3| and 32. The desired convex radius is then added to this setting. For a concave radius. the desired concave radius is subtracted from the center setting.

It will be appreciated that any given: combination of angles and radii can bev obtained with the proper setting of the dresser, and those shown in Fig. 9 are only examples. r .y

As shown in Figs. `6, 'l and 8, I have provided an attachment for cutting concave radii which will form a U-shaped concave radius with a minlmum of 11; radius, at 180 degrees. With this attachment the stud 60 is inserted into the opening 41 and fastened in the diamond clamp 50. A.

\mond mounted in said upright. means for adjustably limiting the movement of said swivel` member, said means including a 'pair of rings,

stops mounted on said rings, means for adjustably xing the position of said rings, and a stop engaging member on said swivel member.

2. A dresser including a pivotal base, means for limiting the pivotal movement of said base to predetermined limits'said means including a pair of rings mounted for rotation on the same pivot as said base, stops mounted on said rings, means for adjustably positioning the position of said rings, a stop engagingv memberon said base. an arm mounted on said base for swinging action thereon, and a diamond carried by said arm.

A saidshaft adapted to move therewith, a cutting 3. A device for dressing radii and angles including a base.. a pair of rings bearing stops mounted on said base, means for iixing said rings with their stops at -any desired point, a swivel base mounted on said base for rotation thereon, a member on'said swivel base adapted to engage said stops, a housing slidably mounted on said swivel base, means for fixing the .position of said housing with relation to said swivel base, a bracket on said housing, a shaft in said housing. an upright engaging said shaft, means on vsaid upright to releasably engage Said bracket to position said upright, and a cutting tool mounted in said upright.

4. A cutting device including a pivotal base, a pair of stop members adapted to engage a member onsaid pivotal base to limit the movement .of said base to one or morepredetermined angles,

a housing slidably mounted on said pivotal base, means for predetermining and xing the position of said housing with relation to said pivotal base; a shaft mounted in said housing, an upright on member in Ysaid upright, and means for limiting the movement of said upright.

5. A tool mounting including a pivotal base having graduations thereon, a pair of ring members pivotally mounted below said base, stops on said ring members, a member for clamping said ring members, said member carrying a vernier plate adapted to register with the gradua tions on said pivotal base, land a stop engaging member on said pivotal base. V

6. A radii and angle dresser including a pivotal base, a stop engaging member on said base, adjustable stop members pivotally mounted on the same pivotal axis as said base adapted to engage said stop engaging member, a housing mounted on said pivotal base and movable laterally with relation thereto, means for determining and nxing the center of said housing with relation to said pivotal base, a shaft in said housing, an upright on said shaft adapted to swing thereon, a cutting tool in said upright, and means for rotating said device between the points defined by said stop members. HARRY S. JAKOBSEN. 

